![]() ![]() Number.b = ReadByte(#File) negative and positive values returned But 0 or zero, is also the error return of the Readbyte(File) and ReadAsciiCharacter(File), so. To me it all (still) makes some difference as a midi file doesn't handle negative byte-values and can have a many bytes with value 0. To use that source do change this first : Look for example at the Procedure.l ReadVarLen(File.l) and Procedure.l VarLenToNum(VarLen.l) here ![]() Quit a lot do read MIDI files with result = Readbyte(File) in different ways, result declared or not, with masking or not, elsewhere a long (result.l). Trying to find out how to setup a good detection of the 'running status' in midi files I find a lot of sources here which give different undefined errors on analyzing midi-files. Procedure.l ParseMidiChunk(File.l, *Chunk.I'm becomming more and more confused on this. Result = Handler(Time, MetaEvent, Size, *Buffer) ![]() Handler = EventHandlers(#MidiParser_Event_Meta) Procedure.l ParseMidiMeta(File.l, Time.l, MetaEvent.l) Handler = EventHandlers(#MidiParser_Event_System) Procedure.l ParseMidiSystem(File.l, Time.l, Event.l) Result = Handler(Time, Event, Size, *Buffer) Handler = EventHandlers(#MidiParser_Event_SysEx) Procedure.l ParseMidiSysEx(File.l, Time.l, Event.l) Result = Handler(Time, Event, Channel, Param1, Param2) Handler = EventHandlers(#MidiParser_Event_Command) the command is valid so parsing continues RaiseMidiError(#MidiParser_Error_Command) If Value - = #MIDI_Track_Single And *Header\wTrack $C And Event $D ![]() Procedure.l VarLenSize(Value.l, IsVarLen.l = #False) If IsFile(File) And VarLen #MIDI_VarLen_Error *VarLen = | (*VarLen\b & $7F) NumToVarLen(Num) Tempo Set Tempo (BPM) : " + StrD(60 * 1000 * 1000 / Tempo)ĭebug "Finished (" + Str(nTracks) + " tracks found)"įor now i only pass through the events (and meta-events) i don't debug but i made it like Zapman so it is simple to add what's missing. S$ + " Note On : " + Str(Note) + " Velocity : " + Str(Velocity) S$ = Str(Time) + " -> Channel : " + Str(Channel) S$ + " Note Off : " + Str(Note) + " Velocity : " + Str(Velocity) While Not (Event = $FF And MetaEvent = $2F) While Not EndOfTrack If Not Error And Chunk\dwType = #MIDI_Chunk_Track > - #MIDI_Chunk_Trackĭebug "UnknownChunk : " + PeekS(Chunk, 4), 1 OpenWindow(0, 0, 0,0,0, #WS_OVERLAPPEDWINDOW | #WS_MAXIMIZE,"Read MIDI header")Ĭode: Select all > - > 0) & $7F ProcedureReturn LOF LOF= len of header and start of data HMF = AllocateMemory(Lof()) all file to memory Procedure MFload() hMF= address of the starting memory For the MIDIfileįilename$ = OpenFileRequester("Load MIDI file", "*C:\.mid", "MIDI |*.mid", 0) MessageRequester("STOP", "Header " + a$ + " UNKNOWN", 0) ProcedureReturn LenHd returns Len of header dataĭebug Str(LenTrk) + "=Length of Track data" 4 char ASC: M,T,h,d = header chunk - M,T,r,k = track header chunkĭebug Str(LenHd) + "=Length of header data" Procedure HeaderData(*PO) reads 3 16-bit words stored MSB first 6 Bytes lengthĭebug Str(TimRes) + "=Number of delta-time ticks on a quarter note" Procedure.l P4(*PO) returns 4 Little Endian Bytes from *PO Procedure.w P2(*PO) returns 2 Little Endian bytes from *PO Procedure.s PS(*PO, LE) get string LE bytes from *POĪ$ = Space(LE) get Titles, Lyrics,Instrument names and other strings embedded on the Midi streamĬopyMemory(*PO, LE) beware: only valid for strings other data content many chr(0) Thanks Psychophanta For the Little Endian ASM procedures ![]()
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